From 662bb9ad89ad4df2cc8d36cffd12ccfb4be3aab5 Mon Sep 17 00:00:00 2001
From: Aaron Dewes <aaron.dewes@web.de>
Date: Sat, 22 Aug 2020 14:38:56 +0200
Subject: [PATCH] Compositor 0.2

I'm developing a custom wayland compositor for the QT5 port.
This is Version 0.2, which fixes the scalling of the background
if the background is smaller or bigger than the screen.
---
 buildroot/package/compositor/compositor.mk |  2 +-
 qwindow-compositor/qwindow-compositor.qrc  |  4 ++--
 qwindow-compositor/window.cpp              | 25 +++++++++++-----------
 qwindow-compositor/window.h                |  2 +-
 4 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/buildroot/package/compositor/compositor.mk b/buildroot/package/compositor/compositor.mk
index 0b549ad8c..2621fb381 100644
--- a/buildroot/package/compositor/compositor.mk
+++ b/buildroot/package/compositor/compositor.mk
@@ -5,7 +5,7 @@
 #############################################################
 
 
-COMPOSITOR_VERSION = 0.1
+COMPOSITOR_VERSION = 0.2
 COMPOSITOR_SITE = $(TOPDIR)/../qwindow-compositor
 COMPOSITOR_SITE_METHOD = local
 COMPOSITOR_LICENSE = BSD-3c
diff --git a/qwindow-compositor/qwindow-compositor.qrc b/qwindow-compositor/qwindow-compositor.qrc
index 509859d70..a147b6639 100644
--- a/qwindow-compositor/qwindow-compositor.qrc
+++ b/qwindow-compositor/qwindow-compositor.qrc
@@ -1,5 +1,5 @@
 <RCC>
-    <qresource prefix="/">
-        <file alias="background.jpg">./background.jpg</file>
+    <qresource>
+        <file alias="background.jpg">background.jpg</file>
     </qresource>
 </RCC>
diff --git a/qwindow-compositor/window.cpp b/qwindow-compositor/window.cpp
index c439d20a8..eeb8bca70 100644
--- a/qwindow-compositor/window.cpp
+++ b/qwindow-compositor/window.cpp
@@ -55,6 +55,7 @@
 #include <QOpenGLTexture>
 #include <QOpenGLFunctions>
 #include <QMatrix4x4>
+#include <QPainter>
 
 #include "compositor.h"
 #include <QtWaylandCompositor/qwaylandseat.h>
@@ -72,25 +73,25 @@ void Window::setCompositor(Compositor *comp) {
 
 void Window::initializeGL()
 {
-    QImage backgroundImage = QImage(QLatin1String(":/background.jpg")).rgbSwapped();
-    backgroundImage.invertPixels();
-    m_backgroundTexture = new QOpenGLTexture(backgroundImage, QOpenGLTexture::DontGenerateMipMaps);
-    m_backgroundTexture->setMinificationFilter(QOpenGLTexture::Nearest);
-    m_backgroundImageSize = backgroundImage.size();
     m_textureBlitter.create();
     m_compositor->create(); // the compositor's hardware integration may depend on GL
 }
 
 void Window::drawBackground()
 {
-    for (int y = 0; y < height(); y += m_backgroundImageSize.height()) {
-        for (int x = 0; x < width(); x += m_backgroundImageSize.width()) {
-            QMatrix4x4 targetTransform = QOpenGLTextureBlitter::targetTransform(QRect(QPoint(x,y), m_backgroundImageSize), QRect(QPoint(0,0), size()));
-            m_textureBlitter.blit(m_backgroundTexture->textureId(),
-                              targetTransform,
-                              QOpenGLTextureBlitter::OriginTopLeft);
-        }
+    QColor backgroundColor = QColor(0xde, 0xde, 0xde);
+    QImage backgroundColorImage = QImage(this->geometry().size(), QImage::Format_RGB32);
+    backgroundColorImage.fill(backgroundColor);
+    QImage backgroundImage = m_backgroundImage;
+    if(this->geometry().width() < backgroundImage.width() || this->geometry().height() < backgroundImage.height()) {
+        backgroundImage = m_backgroundImage.scaled(this->geometry().size(), Qt::KeepAspectRatio, Qt::SmoothTransformation);
     }
+    QPainter painter(this);
+    int deltaX = this->geometry().width() - backgroundImage.width();
+    int deltaY = this->geometry().height() - backgroundImage.height();
+    painter.drawImage(this->geometry(), backgroundColorImage);
+    painter.translate(deltaX / 2, deltaY / 2);
+    painter.drawImage(backgroundImage.rect(), backgroundImage);
 }
 
 QPointF Window::getAnchorPosition(const QPointF &position, int resizeEdge, const QSize &windowSize)
diff --git a/qwindow-compositor/window.h b/qwindow-compositor/window.h
index c16e726bf..d7301bcc6 100644
--- a/qwindow-compositor/window.h
+++ b/qwindow-compositor/window.h
@@ -95,7 +95,7 @@ private slots:
     static QPointF getAnchorPosition(const QPointF &position, int resizeEdge, const QSize &windowSize);
 
     QOpenGLTextureBlitter m_textureBlitter;
-    QSize m_backgroundImageSize;
+    QImage m_backgroundImage = QImage(QLatin1String(":/background.jpg"));
     QOpenGLTexture *m_backgroundTexture = nullptr;
     Compositor *m_compositor = nullptr;
     QPointer<View> m_mouseView;